Relief-valve.



M. Mm'rz.s RELIE` VALVE. APPLICATION FILED PEB. 24, 1911.

1,133,738. Patented Mar. 30, 1915.

M22/X677 f?" rrErTEn sTATEs PATENT OFFICE.

MIKE MINTZ, OF ROCK ISLAND, ILLINOIS, ASSIGNOR TO GEARLESS AUTOMATICPUMP COMPANY, OF ROCK ISLAND, ILLINOIS, A CORPORATION 0F ILLINOIS.

' RELIEF-VALVE.

Patented Mar. 30, 1915.

Application filed February 24, 1911. seriai No. 610,642'.

T0 all whom it may concern:

Ie it known that I.A MIKE MINTZ, a citi- '/.en of the, United States,residing at Rock Island. in the county of Rock Island and State ofIllinois. have invented new and usef ful Improvements in Relief-Valves,of which the following is a full, clear. concise, and exact description,reference being had to the accompanying drawing. forming a part of thisspecification.

My invention relates to improvements in relief valves and has for itsobject the production of a valve. by means of which the accumulative oiland oil laden air in the interior of the chamber may be withdrawn orforced therefrom.

A further object is the prodiction of a device. by means of which thepressure below the diaphragm in a diaphragm valve chamber may be quicklyreduced to atmospheric.

A. further object is the. production of a valve of simple and cheapconstruction, and one that is not liable to get out of order.`

These. and such other objects as may hereinafter appear. are attained bymy device, an embodiment of which is illustrated in the accompanyingdrawing, in which- Figure 1 represents a sectional view of a diaphragmvalve casing equipped with my improved valve; Fig. 2 represents anenlarged view of a. portion of Fig. 1.

Like numerals of reference indicate like parts in the several figures ofthe drawing.

Referring now to the drawing, A represents a diaphragm valve casinginterposed between a compressor and a storage reservoir, and comprises alower shell or member having a base 4, and an upper shell or member 5adapted tobe secured in any desired manner to the lower shell, andhaving a diaphragm 6 interposed therebetween, dividing the interior ofthe chamber into a lower chamberI A and an upper chamber A2.

The diaphragm has a centrally located valve opening 7 controlled by aspherical ball valve stem 8 mounted on a post 9 screwed into the base 4.From the upper chamber a pipe 10 communicates with the storage tank (notshown), and the upper chamber is also in communication with an automaticswitch. and the lower chamber in communication with the motor andcompressor system. which parts are not shown but which are fullyillustrated and described in companion applications filed on even dateherewith. The air passing into the `lower chamber always carries with ita great deal of oil in suspension, having taken it up from the pump` cvlilulers` and it becomes a serious problem to remove the oil andprevent it from clogging up parts of the machine.

' It will be noted that the opening 11, through which the air and gas isforced into the lower chamber A., is larger than the valve opening 7,through which it is forced out. Consequently the air and gas laden witha certain amount of oil is thrown violently about the chamber A andnecessarily gives up the greater part of the oil which collects on theunder side of the diaphragm 6 and the inner walls of the casing and vgravitates to the bottom of the chamber. W'hile I have shown the openinginto the lower chamber as coming in from the center, I can. if I prefer,have it enter tangentially and thus give the entering air and gas awhirling effect in order to more quickly relieve it of its oil.

Communicating with the extreme bottom .of the chamber is a passage 12opening into a chamber 13 in the base, this chamber opening through thewalls of the base 4. I provide a valve B, the screw threaded end 14 ofwhich is screwed into the chamber 13. .A threaded bushing 15 is screwedinto the end and provided with a small passage 16 communicating with apassage 17 within the valve casing 18. The inner end of the passage 17is formed with a seat 19 for a ball valve 20 of less diameter than thepassage 17. and held in place against the seat by means of a spring 21resting against the ball and the end of the bushing. A smaller passage22 extends from the end of the passage 17 into an expansion chamber 23and passage 24 extends from the chamber 23 .through the casing in linewith the passages 17 and 22.

A plunger ts within the passages 22-24, passing through the chamber 23.This plunger is provided with a head 25, a comparatively large portion26 adapted to slide snugly within the passage 24, and a smaller end 26aadapted to slide within the passage 22 and being much smaller than thepassage itself. The end of the plunger rests against ing with the chamthe ball valve which is considerably smaller than the cross-section areaof the vpassage 17. Y

The nozzle 27 is provided with 4a downwardly extending assage 28communicatlates Within the chamber 13 and passage l2 and in the passage17 back of' the valve. As soon as the valve is opened, the valve 7 beingclosed, the pressure Within the diahragm chamber A forces the oil andair etween the sides of the ball and the- Wall of the passage 17 intothe passage 22 and the chamber 23. It is understood, of course, thatlthe oil, as it is forced through the valve, becomes mixed with air orgas, and the resulting mixture has an opportunity lto expand in thechamber 23 and passage 28 `anol then expand still further in the second.expansion chamber `or oil A receptacle 29, Where the oil will becollected and returned to its original source through the passage 31, asexplained in the companion application heretofore referred to. AIt willbe noted that When the valve is open, the face 32 of the head 25 reststightly against the valve casing, andthe enlarged er 23 and opening intosecond expansion champortion 26 of the the opening 24, thus preventingany escape of oil or oil laden air or gas, except through the dischargenozzle 27 into the. oil receptacle 29. By inclining the valve at anangle, I might omit the spring and let the ball .be held in place bygravity, but I prefer the construction illustrated in the drawing.

I have thus produced a simple yet efficient device-that will serve tokeep the syster free from oil, and also relieve the pressure beneath thediaphragm.

I claim A device -of the class described, comprising a casing having apassage extending therethrough and a ber intermediate the ends of saidpassage, second expansion chamber and a discharge passage opening from'said first chamber and communicating with the second expansion chamber,a threaded bushing one'end of said first named plunger fitting Withinthe other end, the passage beyond the end of said plunger bein enlarged,a ball valve seat Within said enlargement, a ball, and. a spring mountedback of s ball and normally holding said ball against' the valve seat. f

In Witness whereof, I have hereunto subscribed my name in the presenceof two witn'ees. p

y 4 MIKE MINTZ.A

vWitnesses: y l

BENJ. F. SCHRIVER,

NELLE COLLINS.-

plunger lits snugly withincentral expansion chamfitting Within passage,and a

